The infinity bug is connected across the phone-line of a distant phone in parallel mode. It uses surface-mount resistors, capacitors, transistors and diodes. It gets operating current from the phone line (leech device), no external power supply is required.
This VHF TV TRANSMITTER can be used to transmit movies from your PC to your living room, run a college TV station, hotel cable system info pages, re-transmit the TV program you’ve never been able to receive in your valley, cover rural areas of Africa with TV signal from satellite stations and other system [...]
This project can transmits phone conversation up to 30 metres (100 feet) to an ordinary FM receiver. You can experiment to get greater transmission range away from the phone line by adding an aerial (about 150 cm of 26 gauge wire) to the collector of T2 (see circuit below).
To use phone transmitter, you need to [...]
The projects shows you how to build simple low cost Inductance Meter based on popular IC 555. The 555 works in its most simple rectangle oscillation configuration. In this mode, the duty-cycle should be around 50%, but this depends on the load on pin 3. Over the amplifying transistor Q1 the AC is given on [...]
Power Engineering International is the leading magazine for the global electric power generation and transmission industry. It provides articles on new technologies and installations and analysis. Subscribe Power Engineering Magazine for free - limited.
EDN magazine provides how-to solutions for design engineers in the electronics industry. Engineers turn to EDN because they know they will always find valuable design techniques that they can use to do their jobs faster. Subscribe EDN Magazine for free
Oracle Magazine contains technology strategy articles, sample code, tips, Oracle and partner news, how to articles for developers and DBAs, and more. Oracle (NASDAQ: ORCL) is the world's largest enterprise software company. Get it For free
